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2- Try giving him company, its proved that in cases of both intraspecific, or extraspecific agression, providing some kind of distraction, may reduce the levels, and intensity of that same agression.

3- Try condiction his atitude by planting plastic plants, solidly attached to a rock. if he can't rip them mayb be he gets used to not do it, and then you can replace the plastic with living plants again (this is a more theoretical aproach).

4- If you can't beat them join them and just keep'em comming, that is to say, keep changing badly treated plants, not a solution in itself, but a paliative, you will stil have a good looking tank at leat for some time after you change your plants. (this was the joke part)

There is a fifth option to nicks very good answer. Oscars don't really need plants regardless of what people say and can be breed and kept without plants if the decoration is otherwise suitable. There are today many wild (intrusive) oscar populations on different places in the world which thrives in water with almost non existing vegetation. Using plants is however the easiest and cheapest way to decorate an aquarium that is suitable for Oscar fish and is therefore to be recommended to most aquarists.

5- You can add roots to your aquarium that spans from the bottom to the surface of the aquarium providing the Oscars with the feeling of security they otherwise gets from plants. roots are however often expensive. Using this technique with Microsorium pteropus growing on the roots perhaps with a few floating plants create very beautiful aquariums.

I would also like to add "cichlid grass" to Nicks list of hardy plants that you can try.